El método científico es el conjunto de pasos necesarios para obtener

El método científico es una metodología para obtener nuevos conocimientos, que ha caracterizado históricamente a la ciencia, y que consiste en la observación sistemática, medición, experimentación y la formulación, análisis y modificación de hipótesis.​ Las principales características de un método científico válido son .

Explanation:

2b2t

explanation:

2b2t

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol